Laboratory experiments were conducted with 60 and 80 cm columns of sandy soil using Na 131I and Na235SO4 as tracers. In the 60 cm column when capillary water rose to 30, 40, 50 and 60 cm, the thickness of the concentrated salt layer was 5, 8, 9.9 and 12.5 cm, respectively. In the 80 cm treatment, capillary water failed to reach the top of the column and the concentrated salt layer was formed at 60-65 cm, which moved slowly further upwards as a result of evaporation.